Steam-derrick



2 sheets-Sheet 1.

(No Model.)

0. G. LYMAN. {STEAM DERRICK.

Patented'Mar. 4, 1884,.

WITNESSES ATTORNEYS N PETERS. PhalwLithugripMf, Wahin tan. D. (l

' (No Model.) V 2 Sheets-Sheet 2.

- G. 0.;LYMAN.

STEAM DEER-10K.

Patented Mar. 4, 1884.

wk @%wm WITNESSES ATTORNEYS.

n. FEIERS. mwmmwm W UNITED STATES PATENT OFFicaE.

' CHESTER O. LYMAN, OF CLEVELAND," OHIO.

STEAM-DERRICK.

SPECIFICATION forming part ofLetters Patent No. 294,395, dated March 1, 1884.

i Application filedseptember 14. 1883. (No model.)

f aZZ whom'ir' may concern.

Be 1t known that I,.CHESTER O. LYMAN, of

Cleveland, in the county of Cuyah oga and State steam-derricks;and it consists, first, in mount-- ing the steam mechanism-for operating the derrick upon a revolving platform adapted to make a complete revolution or any part thereof; also, in locating upon said platform africtional gear mechanism for raising, holding, and lowering the outer end of a boom-arm whose opposite end is securely hinged to the rotary platform; also, in locating a series of anti-friction rollers underneath said revolving platform,.which in a great degree carry not only the platform and its machinery, but also the boom and its load;.also, in supporting the center of said platform upon an adjustable step by means of a vertical journal resting thereon, as hereinafter more fully described; also, in providing suitable anchorage, with braces, rods, and nuts, for the purpose of holding and governing said step in its vertical position; also, in locating the safety-roller underneath the flange in such a manner as to prevent the upper platform from tilting without raising the base below; also, in providing and locating the combination of braces, whose lower ends rest upon and against the inner sides of the truck-frame, and are held from spreading by the longitudinal rods passing through the sides of said base, both lengthwise and crosswise, and the top or upper end of said braces being firmly united with the hub, thereby forming a firm seat or bearing for the suspended step below, and also a firm bushing through which the step -j ournal passes and is kept in its vertical and central position,and

' thereby becomingthe'center axis of the plat- 'form'motion; also, in providing one or more of the truck-wheels-with a tooth-flange, into which are geared one or more cog-wheels operated by a crank to cause the derrick tobe moved along its track.

I In the drawings, Figure 1 represents aside elevation of my improved derrick. Fig. 2 is a detailed sectional view, showing the construction of the segment and roller. Fig. 3 represents a longitudinal vertical section of Fig. 1. Fig. 4 isa section taken through the line as w in Fig. 3. y

In Fig. l, M are anti-friction rollers adapted to travel on a circular track, L, and are propelled thereon by pressure of the upper circular bearing, L, resting thereon; hence it is apparent that the said rollersM travel only onebeing anti-friction in their movement, plainly shows a great saving of power over wheels acting on an axle, and also a saving of wear on the tracks. a

0 denotes absence of the outer band,which, when in its place, serves to keep the said rollers in proper place and equidistant from each other.

E is the driving-pinion secured to the upper platform, andmeshes into the circular stationary rack resting upon the base below, whereby the platform, by turning of the pinion, is caused to revolve. in either direction by use of the lever in hands-of the operator.

1 is a truck-wheel whose flange is composed of cog-teeth, into which are geared a series of governed by a crank, causing the derrick to move along itstrack J.

of which forms also the segment circular rack, into which meshes the pinion E, and the under side of said rack is also provided with a circular horizontal flange, underwhich islocated the safety-roller P in such a manner as to prevent the platform from rising without lifting the truok-frame below. The roller 1? is secured to the upper platform by the braces h h, as shown, and is thus loosely carried around, andis not intended to roll against its track, except when the derrick is overloaded, or in .case of receiving a foul hitch, as is sometimes the case when raising its load up through the hatch of a vessel.

In Fig. 3, R R represent two sides of the truck-frame, which is secured against spreading by the use of longitudinal rods, (shown at V half the distance of the platform which propels them, which, when taken together with their In Fig. 2, L is the roller-track, the outer edge.

compound cog-wheels, as shown at I 1 I and v I I are braces resting upon and against the sides of truck-frame R '1. and their upper ends against the hollow hub G", and thus form a firm support for the hub-collar H, said collar serving a twofold purpose: first, a support for the adjustable steprods 1/, and, secondly, as a guide for the rim H, which acts, in conj auction with the band 0, in keeping the rollers M upon the track in uniform position.

The top of platform central bearing is shown at G resting upon an adjustable step, 1 the journal end of which passes through the hub 1"", and is thereby kept in a vertical position, thus not only forming a support to center of platform, but also becomes the axis or center of motion to the platform. The step t by use of its rods and nuts, may carry a greater orless portion of the weight resting upon the platform, and is. also useful in compensating for wear of the various parts and in keeping the machiueryin line, especially that part located near the platform center.

G denotes lower end of the vertical journal resting upon the step, having its lower end separate from the main journal, whereby it may be cast on a chill -that is, cast hardwhile the upper portion, being separately east, may be softer, capable of being turned with a tool to fit the hub through which it passes.

1) is one of two wheels between which is a chain-drum, used for raising or lowering a bucket, as shown in the drawings, and also in Patent No. 222,1ll, granted inc December 2, 1879, which is not here claimed; but I am not aware that a frictional gear mechanism has ever been shown in a revolving derrick for raising, holding, and lowering the end of a boom-arm, as shown.

F denotes one of two wheels between which is located a drum, around which passes a chain, thence around a series of chain-blocks, and to the boom-arm, as shown in the drawings.

E represents one of two friction-collars secured to the driving-shaft. The friction-wheels F, together with their drum, are made fast to the shaft on which they revolve, said shaft being journaled in an eccentric boxing governed by one or more levers.

f is alever, which, when thrown in one direction, causes the wheels F to press against the driving frictionwhccls ll,thereby winding the chain, thus causing the boom to rise, so as, when swung, to clear any obstruction in its passage. Then by a quick reverse movement plaee of depositing its load.

tle pressure on the lever f the wheels F are allowed to slip or slide against thebrake-shoes F until the boom is lowered to come in line with the hatch. or other place of deposit, and there held by means of the lever until the bucket or load is caused to descend by means of the lifting-drum (located at the right of the drive-shaft) sliding against the brake-shoes, until place of depositing the load is reached, after which, by a reverse movement of the hand-lever, the frictional contact with the said brakcshoes is broken, and at thesame instant said drain-wheels are forced against the driving friction-collars, thereby causing the drum to revolve, windingthe chain or rope attached to the bucket, which, when sufficiently ele vated, is stopped and securely held by a reverse movement of the hand-lever, causing the lifting frictional contact to be brokenand the lifting-wheels to be forced against the brake shoes with sufficient force to hold the bucket at any point within its range. The elements ofthc combination for manipulating thebucket are quite similar to those for raising and lowering the boom, and are each driven by the same friction-collars. At the same time their movements are independent of each other and for a separate purposenamely, the combination on the left for governing the sweep of the boom, and the other, situated at the right, governs the raising,holding, or lowering ofthe bucket f until the bucket or load descends. Thus it will be seen that the object of this lastnamed device is to lengthen or shorten the sweep of aboom-arm, which by this frictional 9 1)- with the hub G, substantially as shown and described.

it. The adjustable step G and rods and nuts r/, in combination with the step-journal, sub stantially as and for the purposes described.

CHESTER C. LYMAX.

\Vitnesses:

C. H. BABCOCK, \V. \Vnrrn. 

